Problem after disabling subcategories 'no image'

[ZuZu]

Hi,

http://www.prestashop.com/forums/viewthread/21681/general_discussion/solved_how_do_i_disable_the_subcategories_graphic_image_no_image_available

I followed the instructions of both Rocky and Patric and it worked. But: afterwards I noticed that the amount of products in the (sub)categories were followed by a strange sign. See attachment please. How to fix this little issue?
Thanks!